From the Soil Micromorphology Slide Collection

Micromorphological description Of slide: The soil fabric is massive and consists of the following components:
frequent mineral particles 10-200 vm (9.7%); common elliptical diatoms, especially Pinnularia sp. (15.8%); occasional black opaque organic fragments 50-250 vm (7.6%); amorphous (unrecognizable) material containing particles of diatoms as well as abundant organic cell structures (61 .7%); void space (5.1 Percentage areal distributions were assessed from thin section by point counting approximately 3000 points on the thin section at 125x magnification.

Data for the horizon
Horizon sampled: Cg
Depth sampled: 25-40 cm
Physical and chemical data available: pH = 5.0, OC = 1 2.0%, N = 0.9%
Macromorphological description of horizon: 10 YR 3/2 silty clay loam; weak granular structure; few fine vertical roots to 20 cm depth; smooth boundary.
Micromorphological description of horizon: See references

Data for thin section
Preparation of sample: Acetone
Impregnating medium: Polyester resin
Thickness of section: 30 µm approximately
Orientation of section: Vertical

Soil Classification U.S.: Entisol
F.A.O.: Gleysol
Canada: Limno Humisol

Elevation: 95 m above sea level
Physiographic position: Basin swamp
Topography and hill slope position: Level
Parent material: Peat material (woody-sedge sedimentary, sedge-sedimentary and sedimentary)
Soil climatic data and/or soil water balance: Mesic mild humid [Soil Climates of Canada map (1 975))
Vegetation: Dominant vegetation in basin swamp is Spiarea douqlasii (80% cover) and Salix sp. (10% cover)

Data for 35-mm slide
Frame length: 1 .0 mm
Light mode: Plane polarized

Fox, C. A. and C. Tarnocai. 1989. The micromorphology of a sedimentary peat deposit from the Pacific temperate wetland region of Canada. p. 31 1-319. In L. A Douglas (ed.). Soil micromorphology: A basic and applied science. Proc. 8th IWMSM. Elsevier, New York.
Tarnocai, C. and Schuppli, P. 1987. Sedimentary peat in Canadian peatlands. p. 25-37 In C. D. A. Rubec and R.P. Overend (eds.), Proc. Symposium '87 Wetlands/Peatlands. Edmonton, Canada. Source - C. A. Fox

Slide BF35. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.